AC500 PLC to PLC communication
I have two PM592-ETH controllers,i want a communication between Two PM592-ETH controllers...
I want to read data from one PM592-ETH Controller and write a data to other PM592-ETH Controller.
Without knowing more about your particular installation its hard to recommend a "best". If you're already using 1 or more communication protocols, it's generally easier and cheaper to just use the same thing.
It also depends if you need true peer-to-peer or whether a master-slave system works for you, and just as importantly how your requirements might change in the future. Modbus does work well if you only need Master / Slave and you do not plan to expand with a different protocol in future.